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As a specialized manufacturer with a focus on industrial flow control since 2016, Shanghai Zhibang Valve Manufacture Co., Ltd. is proud to present our high-performance API 6D Pneumatic Trunnion Mounted Ball Valve. Engineered specifically for the demanding environments of offshore platforms and marine vessels, this valve represents a fusion of robust API 6D design principles with reliable pneumatic automation. We understand that in offshore and marine applications, failure is not an option. Our valve is built to deliver exceptional sealing performance, withstand corrosive seawater atmospheres, and provide dependable, low-maintenance operation for critical isolation and control duties, from cargo handling and ballast systems to firewater and process lines.
Core Design & Technical Specifications:
This valve is constructed to the stringent requirements of API 6D, a specification dedicated to pipeline and piping valves, ensuring design integrity, material traceability, and testing protocols suitable for severe service.
- Trunnion-Mounted Design: Unlike floating ball valves, the ball in a trunnion design is fixed on a supported shaft (trunnion). This configuration is ideal for high-pressure and large-diameter applications common in offshore settings. The design minimizes operating torque, reduces seat wear, and ensures stable performance even under pressure fluctuations or thermal cycling.
- Pneumatic Actuation System: The valve is equipped with a double-acting or spring-return pneumatic actuator, allowing for rapid and precise quarter-turn operation. Actuators can be specified with solenoid valves, limit switches, and positioners for integration into automated control systems, enabling remote operation from a central control room—a critical feature for unmanned or difficult-to-access locations.
- Superior Sealing Integrity: We employ a combination of primary and secondary sealing systems. The primary seats are often spring-loaded, maintaining constant contact with the ball for bubble-tight shut-off. Secondary stem seals and body seals provide additional barriers against external leakage, a paramount safety requirement in offshore environments.
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Material Selection for Corrosion Resistance: Materials are selected based on service media and NACE MR0175/ISO 15156 standards for sour service when required. Common configurations include:
- Body/Ball/Trunnion: ASTM A216 WCB (Carbon Steel), ASTM A351 CF8/CF8M (Stainless 304/316), ASTM A995 4A/5A (Duplex/Super Duplex Stainless Steel).
- Seats & Seals: PTFE, RPTFE, PEEK, or metal seats (Inconel, Stellite) for high-temperature or abrasive services.
- Stem: ASTM A182 F6a (13Cr) or F316, often with a hardened surface for durability.
Key Advantages and Client Benefits:
- Enhanced Safety & Environmental Protection: The valve's fire-safe design (typically to API 607/API 6FA) and double-block-and-bleed (DBB) capability provide critical safety layers, preventing catastrophic leaks in case of fire or during maintenance.
- Reduced Lifecycle Cost: The robust trunnion design and high-quality materials result in lower operating torque, reduced wear on seats and seals, and extended service intervals. This translates to lower maintenance costs and less downtime over the valve's operational life.
- Operational Reliability in Harsh Conditions: The valve is designed to perform reliably under vibration, shock loads, and wide temperature variations encountered at sea. The pneumatic actuator offers consistent power output unaffected by location, unlike hydraulic systems which can be sensitive to temperature.
- Flexibility and Customization: While we offer standard designs, valves can be customized with specific trim materials, extended stems for insulation, anti-blowout stems, lockable devices, and various paint coatings (e.g., epoxy for marine corrosion protection) to meet exact project specifications.
Typical Technical Parameters Table:
| Parameter | Specification / Range |
|---|---|
| Size Range (NPS) | 2" to 48" (DN50 to DN1200) |
| Pressure Class (ASME) | Class 150, 300, 600, 900, 1500, 2500 |
| Face-to-Face | Per API 6D / ASME B16.10 |
| End Connection | RF, RTJ, BW per ASME B16.5 / B16.25 |
| Leakage Class | Seat: API 6D (Bubble Tight), Fire Test: API 607/6FA |
| Pneumatic Actuator Air Supply | 40-120 psi (2.8-8.4 bar), Dry, Clean Air |
FAQ (Frequently Asked Questions):
1. What is the main advantage of a trunnion-mounted ball valve over a floating ball valve for offshore use?
The trunnion-mounted design is superior for high-pressure, large-bore applications typical offshore. It significantly reduces operating torque, minimizes seat wear (extending service life), and provides more stable sealing under pressure surges, making it safer and more reliable for critical services.
2. Can this valve be used in "sour service" (H2S containing) environments?
Yes, but it requires specific material qualifications. Valves can be supplied with NACE MR0175/ISO 15156 compliant materials (e.g., specific grades of stainless or duplex steel with controlled hardness) and appropriate trim. This must be specified at the time of order.
3. What certifications do you provide with the valve?
As a manufacturer operating under an ISO9001 Quality Management System, we provide a full Material Test Report (MTR/Certificate of Conformity), a detailed inspection test report covering hydrostatic shell/seat tests per API 598/API 6D, and a data book. Third-party inspection is available upon request.
4. What is the lead time for a typical order?
Lead time varies based on size, material class, and order quantity. For standard carbon steel configurations in common sizes, lead time can be 8-12 weeks. For special materials or large diameters, it may extend to 16-20 weeks. We provide a firm schedule upon receipt of detailed specifications.
5. Do you offer fire-safe design?
Yes, fire-safe design is a standard or optional feature. Our valves can be designed and tested to meet API 607 (quarter-turn) or API 6FA standards, which include secondary metal seat sealing in the event of a fire that destroys the soft seats.
6. Can the pneumatic actuator be configured for fail-safe operation?
Absolutely. We offer spring-return (single-acting) actuators that will automatically drive the valve to a pre-defined safe position (Open or Closed) upon loss of air supply. Double-acting actuators require air to move in both directions.
7. What kind of after-sales support do you offer?
We provide comprehensive technical documentation, installation and maintenance manuals. For international projects, we can arrange technician support for supervision of installation and commissioning, subject to agreement. Spare parts kits are also available.
8. How do you ensure packaging for sea transport to prevent corrosion?
Valves undergo thorough cleaning and preservation. They are coated with VCI (Vapor Corrosion Inhibitor) and wrapped. Flange faces are protected with wooden or plastic covers. For marine environments, crating is used for optimal protection during long sea voyages.
Backed by our ISO9001 certified manufacturing processes and an annual export value demonstrating global reach across North America, Europe, Asia, and beyond, Shanghai Zhibang Valve stands as a reliable partner for your offshore and marine valve needs. Our valves ship from major ports like Shanghai and Guangzhou, ensuring logistical efficiency. We invite you to leverage our engineering expertise to specify a valve that delivers uncompromising safety, durability, and performance for your most challenging applications. Contact our technical sales team today to discuss your project requirements and request a detailed quotation.
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